JP5481738B2 - Field inspection device - Google Patents

Description

  The present invention relates to a visual field inspection apparatus for inspecting a visual field of a subject.

  Conventionally, the invention described in Patent Document 1 below is known as a technique for examining the visual field of a subject. Patent Document 1 describes a perimeter having an aspherical bowl. This perimeter consists of a bowl with a concave interior towards the patient and a projector that projects a light target around the patient's eyes staring at the bowl at a position inside the concave Yes. In this perimeter, the patient's peripheral visual field sensitivity is measured by answering when the patient can visually recognize the light target.

JP 07-504589 A

  The perimeter described above presents a visual target of light to the peripheral visual field in a state in which the patient is staring at one point on the target display surface and answers whether the target can be observed or not. Is to measure. However, since it is necessary for the patient to fix one point for a long time, there is a lot of physical burden. Further, since the examination is a long time, the fixation may be lost, an inaccurate examination result is obtained, and the examination is further prolonged by re-inspection.

  Therefore, the present invention has been proposed in view of the above-described circumstances, and an object thereof is to provide a visual field inspection apparatus capable of performing visual field inspection in a short time.

  A visual field inspection apparatus according to a first invention that solves the above-described problem includes a fixation target that a subject fixes, a first stimulus target and a second stimulus target arranged in the subject's field of view, Display means for displaying a third stimulus target that connects the first stimulus target and the second stimulus target, and the subject operates the second stimulus target from the first stimulus target. An operation means for performing an operation of responding that the target is extended to the visual target or an operation of responding that the third stimulus target is extended from the second stimulus target to the first stimulus target; and the first stimulus view Display control means for displaying the third stimulus target on the display means after a predetermined time after the target and the second stimulus target are displayed on the display means.

  The visual field inspection apparatus according to the first invention, wherein the second invention makes the first stimulus target visually recognized by one eye of the subject, and makes the second stimulus target visible by the other eye of the subject. And binocular separation means for visually recognizing the third stimulus target with both eyes of the subject.

  The visual field inspection apparatus according to the first or second invention, wherein the third invention includes the first stimulus target and the second stimulus target, the display control means, and the first stimulus target. A display style setting function for individually setting a display style of the second stimulus target, and displaying the first stimulus target and the second stimulus target set by the display style setting function; The display control of the third stimulus target is performed so as to interpolate the display modes of the first stimulus target and the second stimulus target.

  According to the present invention, since the visual field can be inspected by answering that the third stimulus target is extended, the visual field inspection can be performed in a short time.

It is a figure which shows the structure of the visual field inspection apparatus shown as embodiment of this invention. It is a figure which shows the display screen of the stimulus target in the visual field inspection apparatus shown as embodiment of this invention, (a) is a display screen when displaying the 1st stimulus target and the said 2nd stimulus target, (b) Shows a display screen when the third stimulus target is displayed, and (c) shows how the subject's third stimulus target is seen. In the visual field inspection apparatus shown as an embodiment of the present invention, it is another example of how the third stimulus target of the subject looks when one target is not included in the visual field. In the visual field inspection apparatus shown as an embodiment of the present invention, it is an example of how a subject's third stimulus target is seen when both targets are included in the field of view. It is a figure which shows the example which displays a fixation target, a 1st stimulus target, and a 2nd stimulus target in the visual field inspection apparatus shown as embodiment of this invention. It is a figure which shows the example which displays a fixation target, a 1st stimulus target, a 2nd stimulus target, and a 3rd stimulus target in the visual field inspection apparatus shown as embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The visual field inspection apparatus to which the present invention is applied inspects the visual field of a subject. A visual field inspection apparatus to which the present invention is applied is configured, for example, as shown in FIG. This visual field inspection apparatus includes a control device 2 as a display control means, a stereoscopic display 1 and stereoscopic glasses 3 as binocular separation means, and an operation unit 4 as an operation means.

  The stereoscopic display 1 includes a fixation target that the subject fixes, a first stimulus target and a second stimulus target arranged in the visual field of the subject, and the first stimulus target and the second stimulus target. And a third stimulus target. Here, the first stimulus target and the second stimulus target are displayed, for example, at the same height position in two different horizontal positions within the display range. The stereoscopic display 1 is connected to the control device 2. The stereoscopic display 1 is controlled by the control device 2 and displays a fixation target, a first stimulus target, a second stimulus target, and a third stimulus target.

  Although the first stimulus target and the second stimulus target will be described later, it is not always necessary to display both, and only one of them can be displayed to examine the visual field of the subject.

  In addition, although the stereoscopic display 1 is used in the example shown in FIG. 1, you may implement | achieve with the stereoscopic display method comprised by a projector and a screen. A lenticular autostereoscopic display may also be used.

  The visual field inspection apparatus may present the fixation target, the first stimulus target, the second stimulus target, and the third stimulus target only to both eyes, but is configured to be presented only to one eye. May be. In this case, the visual field inspection device needs to include the control device 2 and the stereoscopic glasses 3.

  The control device 2 displays the first stimulus target so as to be visible only from one eye of the subject, and displays the second stimulus target so as to be visible only from the other eye of the subject. Further, the control device 2 displays the fixation target and the third stimulus target so as to be visible from both eyes of the subject.

  The stereoscopic glasses 3 are attached to the subject, and the first stimulus target is visually recognized by one eye of the subject, the second stimulus target is visually recognized by the other eye of the subject, and the fixation target and the third stimulus vision are displayed. The mark is visually recognized by both eyes of the subject.

  When the time-division method is adopted as the binocular separation display method, the left eye part and the right eye part of the stereoscopic glasses 3 are used as liquid crystal shutters. The control device 2 displays the fixation target, the first stimulus target, the second stimulus target, and the third stimulus target, and the operation timings of the liquid crystal shutters of the right eye portion and the left eye portion of the stereoscopic glasses 3. Synchronize with. When the control device 2 displays the first stimulus target on the left eye of the subject, the control device 2 displays the first stimulus target on the stereoscopic display 1, opens the left eye liquid crystal shutter, and opens the right eye liquid crystal shutter. Is closed. Further, when the control device 2 displays the second stimulus target on the right eye of the subject, the control device 2 displays the second stimulus target on the stereoscopic display 1 and opens the right-eye liquid crystal shutter and also for the left eye. Close the liquid crystal shutter. Furthermore, the control device 2 may display the fixation target and the third stimulus target on the stereoscopic display 1 when showing the fixed target and the third stimulus target to both eyes of the subject.

  When the polarization method is adopted as the binocular separation display method, the left eye portion of the stereoscopic glasses 3 is a left eye polarizing film, and the right eye portion of the stereoscopic glasses 3 is a right eye polarizing film. When the control device 2 displays the first stimulus target on the left eye of the subject, the control device 2 displays the first stimulus target in the same polarization direction as the left eye polarizing film. In addition, when the control device 2 displays the second stimulus target on the right eye of the subject, the control device 2 displays the second stimulus target in the same polarization direction as the right eye polarizing film. Furthermore, when the control device 2 shows the fixation target and the third stimulus target to both eyes of the subject, the control device 2 can display the fixation target in both the polarization directions of the left-eye polarizing film and the right-eye polarizing film, A tristimulus target is displayed.

  The operation unit 4 includes a direction lever such as a joystick operated by the subject, a mouse, a direction key, or the like. The operation unit 4 performs an operation of responding that the third stimulus target is extended from the first stimulus target to the second stimulus target, or the third stimulus target is changed from the second stimulus target to the first stimulus. An operation to reply that the target has been extended is performed. When only one of the first stimulus target and the second stimulus target is displayed, the operation unit 4 displays the third stimulus target inside or outside from the first stimulus target or the second stimulus target. The extension is manipulated.

  In such a visual field inspection apparatus, as shown in FIG. 2, the control device 2 controls to display a fixation target, a first stimulus target, a second stimulus target, and a third stimulus target.

  First, as illustrated in FIG. 2A, the control device 2 displays a first stimulus target 101 and a second stimulus target 102 at different positions in the display range 100 of the stereoscopic display 1. The first stimulus visual target is visible only with the subject's left eye, and the second stimulus visual target is visible only with the subject's right eye. The first stimulus target 101 and the second stimulus target 102 are displayed at positions where it is desired to examine whether or not the subject's visual field is missing.

  Note that the first stimulus target 101 and the second stimulus target 102 may be viewed with both eyes when visual inspection of both eyes is performed.

  In FIG. 2A, the fixation target 110 is displayed on the stereoscopic display 1 at an intermediate position connecting the first stimulus target 101 and the second stimulus target 102. This fixation target 110 is made visible with both eyes of the subject. The fixation target 110 is displayed in order to concentrate the visual stimulus (consciousness) of the subject at an intermediate position between the first stimulus target 101 and the second stimulus target 102.

  Next, as illustrated in FIG. 2B, the control device 2 displays the third stimulus target 103 so as to connect the first stimulus target 101 and the second stimulus target 102. The third stimulus target 103 is visible with both eyes of the subject.

  Then, the subject recognizes the third stimulus target 103 so as to extend from one stimulus target that is not missing as a visual field to the other stimulus target that is missing from the visual field by an optical illusion. For example, when the first stimulus target 101 is included in the field of view and the second stimulus target 102 is missing from the field of view, as shown in FIG. The illusion is that the first stimulus target 101 is displayed so as to extend from the first stimulus target 101 toward the second stimulus target 102.

  The reason for this illusion is that in the human eye, when a target is present in the field of view, it receives a visual stimulus, and when the brain processes the target displayed after that, the effect of the visual stimulus received earlier is affected. receive. For this reason, when the third stimulus target 103 is displayed, the third stimulus target 103 extends from the first stimulus target 101 displayed in the visual field toward the second stimulus target 102. Illusion.

  In this case, the subject operates the operation unit 4 by recognizing that the third stimulus target 103 extends from the first stimulus target 101 toward the second stimulus target 102. Accordingly, the measurer can inspect that the position of the first stimulus target 101 is included in the field of view but the position of the second stimulus target 102 is missing from the field of view.

  Conversely, when the first stimulus target 101 is missing from the visual field of the subject, the third stimulus target 103 is directed from the second stimulus target 102 toward the first stimulus target 101 as shown in FIG. The illusion is extended. Then, the subject recognizes that the third stimulus target 103 has extended from the second stimulus target 102 in the direction of the first stimulus target 101 and operates the operation unit 4. Accordingly, the measurer can check that the subject's visual field is missing at the position of the first stimulus target 101 and that the subject's visual field is present at the position of the second stimulus target 102.

  Further, when both the first stimulus target 101 and the second stimulus target 102 are included in the subject's field of view, the visual field inspection apparatus is illusioned to extend to the other stimulus target from both of FIGS. The Thereby, the measurer can inspect that both the first stimulus visual target 101 and the second stimulus visual target 102 are included in the visual field of the subject by causing the subject to operate the appearance as such.

  Furthermore, by making the first stimulus target 101 visible to only one eye and making the second stimulus target 102 visible only to the other eye, the visual field of each eye can be examined separately. Therefore, according to this visual field inspection device, the subject can be inspected in an easy state where both eyes are open without having to close one eye not to be inspected with gauze or the like.

  Further, the control device 2 may change the time from displaying the first stimulus target 101 and the second stimulus target 102 until displaying the third stimulus target 103. Furthermore, the control device 2 may change the brightness, size, and color of the first stimulus target 101, the second stimulus target 102, and the third stimulus target 103. Thereby, a test subject's visual stimulus amount can be changed and it can respond to an individual difference in visual sensitivity. For example, for a subject who cannot recognize whether the first stimulus target 101 or the second stimulus target 102 is extended when the third stimulus target 103 is displayed, the third stimulus target is displayed. The visual field can be inspected more accurately by changing the time until 103 is displayed and the brightness, size, and color of the first stimulus target 101, the second stimulus target 102, and the third stimulus target 103. Further, the sensitivity of the visual field can be examined by adjusting the luminance of the visual target. Furthermore, as shown in FIG. 5, by adjusting the size and position of the visual target by the control device 2, it is possible to change the region lacking the visual field to be inspected.

  In this visual field inspection apparatus, the first stimulus target 101 and the second stimulus target 102 have the same display format with respect to the viewpoint of the subject, and the third stimulus target 103 is the first stimulus target 103. It is desirable that the display format connects the second stimulus target and the second stimulus target. As a result, the third stimulus target 103 is the first stimulus target 101 or the second stimulus, rather than the first stimulus target 101, the second stimulus target 102, and the third stimulus target 103 in another display format. The visual field of the subject can be inspected by illusioning to extend from the visual target 102.

  Further, the shapes of the first stimulus target 101 and the second stimulus target 102 are different from each other, and the third stimulus target 103 covers the first stimulus target 101 and the second stimulus target 102. If it is. For example, as shown in FIG. 6 (a), the first stimulus target 101 and the second stimulus target 102 are fan-shaped upper and lower ends, and the third stimulus target 103 is shown in FIG. 6 (b). It is good also as a fan type.

  As described above, according to the visual field inspection apparatus to which the present invention is applied, since the visual field can be inspected using human illusion, the visual field inspection can be performed in a short time.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

DESCRIPTION OF SYMBOLS 1 Stereoscopic display 2 Control apparatus 3 Stereoscopic glasses 4 Operation part 101 1st stimulus visual target 102 2nd stimulus visual target 103 3rd stimulus visual target 110 Fixation visual target 120 Collision point

Claims (3)

A third stimulus that connects a fixation target that the subject fixes, a first stimulus target and a second stimulus target arranged in the field of view of the subject, and the first stimulus target and the second stimulus target. Display means for displaying a target;
An operation that is operated by the subject and answers that the third stimulus target has extended from the first stimulus target to the second stimulus target, or the third stimulus target is changed from the second stimulus target to the first stimulus. An operation means for performing an operation of replying to the extension to the target;
And a display control means for displaying the third stimulus target on the display means after a predetermined time when the first stimulus target and the second stimulus target are displayed on the display means. Inspection device.   Binocular separation means for causing the first stimulus target to be visually recognized by one eye of the subject, the second stimulus target to be visually recognized by the other eye of the subject, and the third stimulus target being visually recognized by both eyes of the subject. The visual field inspection apparatus according to claim 1, further comprising:   The display control means further includes a display style setting function for individually setting a display style of the first stimulus target and the second stimulus target, and the first stimulus target set by the display style setting function. And the second stimulus target is displayed, and the display of the third stimulus target is controlled so as to interpolate a display mode of the first stimulus target and the second stimulus target. The visual field inspection apparatus according to claim 1 or 2.

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